Functions and Measurements 3
N9342C/43C/44C User’s Guide 65
Modulation Analysis
The analyzer provides the optional AM/FM (Option
AMA) and ASK/FSK (Option- DMA) modulation
analysis function for analysis the modulated
signals.
AM/FM Modulation Analysis
Optional AM/FM demodulation analysis provides
modulation metrics, including carrier power,
modulation rate, AM depth/FM deviation, SINAD
and carrier frequency offset. User definable limits
provide Pass/Fail indicators of four types:
Maximum carrier power, Maximum AM modulation
index or FM deviation, Minimum AM modulation
index or FM deviation, and Minimum carrier
frequency offset.
The user can save the waveforms with metrics for
reporting as well as the set- up parameters for
future measurements or analysis. In the following
example, you can use any source available (such as
AM/FM radio) as long as it has AM/FM signal
generation capability.
AM Modulation Analysis
Please refer to the procedures below for the AM
demodulation analysis:
1 Connect the signal generator to RF IN connector
and turn on the signal generator’s AM and RF
output.
2 Turn on the AM modulation analysis function.
Press [MODE], {Modulation Analysis}, {AM}.
3 Press {Carries Freq} > [100] > {MHz} to set the
carrier frequency.
4 Set the attenuation state to Auto (default):
Press {More} > {Attenuation Auto}
5 Press [Disp] > {Y Scale} > {Scale Coupling On} to set
the Y scale auto coupling.
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